Improvement in sliding gas-joints for extension drop-lights



CHARLES DEAVS. Improvement inv Sliding Gas-Joints for ExtensionDrop-Lights. N0.

' Patented May30, 1871-.

CHARLES: DEAVS, on NEW YORK, n.

Y., ASSIGNOR TO THE ARCHER AND PANOOAST MANUFACTURING COMPANY, OF SAMEPLACE.

IMPROVEMAENTIINSLIDING GASFJOINTS FOR ext-Easiest DROP-LIGHTS.

Specification forming part of Letters Patent No. 115,447, dated May 30,1871.

To all whom itmay concern:

Be it known that I, CHARLES DEAVS, of the city, county, and State of NewYork, have invented a new and Improved Sliding Gas-Joint for ExtensionDrop-Lights and other Gas-Fixtures; and I do hereby declare that thefol:

lowing is a full, clear, and exact description thereof, reference beinghad to the accompanying drawing forming a part of this specification: 7l

This sliding joint consists of a box of novel construction intended tobe attached to the outer one of the two pipes to be connected,

\ and to slide upon theinner pipe, and fitted with packing-rings and aninterposed spring, by which the said rings, owing, in part, to theconstruction of the interior of the box, are

i caused to be contracted around the inner pipe and to preserve agas-tight sliding connection. The accompanying drawing represents a Hcentral vertical section of my improved sliding gas-joint, showing itapplied to a gas-pipe,

To enable others to understand the nature of my invention, I willproceed to describe it with reference to the drawing.

A represents a portion of the inner pipe of the joint. 13 and O are twosocket-like pieces which together constitute the box. The upper piece Bhas a cavity formed in it of considerably larger diameter than that ofthe pipe A. The bottom of this cavity is of conical form r and hasextending through it a hole, a, which isof a size to fit snugly'buteasily around the pipe A. Formed on thelower end of this piece 2 is amale-screw thread, b, which screws into a I female-screw thread withinthe mouth of the lower piece 0. In the latter piece there is a cavity ofsimilar diameter to that in the piece B, and having a similar conicalbottom, with an opening, a, for the passage of the pipe A; and belowthis cavity there is provided within the said piece 0 a femalescrewthread, d, into which the outer pipe of the joint is intended to bescrewed. In each of the cavities in the pieces B G are leatherpacking-rings e e, which surround the pipe A. The two sets ofpacking-rings are forced against the conical bottomsof the cavities byan interposed spiral spring, S, which is arranged within the box andsurrounds the pipe A.

The packing-rin gs, being forced into the two conical bottoms of the boxby the spiral spring, are by the conical surfaces caused to becompressed forcibly against the pipe A and form a tight joint. Thespring, exerting a constant worn away or shrunk, contract them and keepthem compressed around the pipe A, and so preserve the joint.

What I claim as my invention, and desire to secure by Letters Patent,is-

The case .B O, of conical form at its inner extremities, in combinationwith the flexible packing e e at each end, and the interposed spiralspring S, as shown and described.

CHARLES DEAVS.

Witnesses:

FRED. HAYNES, R. E. RABEAU.

